I'm using 256 buffer, 44.1 kHz and ASIO4all. I've checked ASIO Full Duplex, Avid ASIO and Primary Sound Drivers too. They have the same latency.

I am using Studio One, Ableton & Cubase too. Other commercial FX plugins doesn't have any latency in all of the conditions, but why Hise fx plugins has? Furthermore not only DynamicsFX, I've made a gain modulation fx plugin, and it has latency too.